(.000562 mg.) of the salt.  Fragments of flies were placed on two leaves near their tips, which became incurved in 15 hrs.  A fly was also placed in the middle of the leaf; in a few hours the tentacles on each side embraced it, and in 8 hrs. the whole leaf directly beneath the fly was a little bent transversely.  By the next morning, after 23 hrs., the leaf was curled so completely over that the apex rested on the upper end of the footstalk.  In no case did the sides of the leaves become inflected.  A crushed fly was placed on the foliaceous footstalk, but produced no effect.

Drosera spathulata (sent to me by Dr. Hooker).—­I made only a few observations on this Australian species, which has long, narrow leaves, gradually widening towards their tips.  The glands of the extreme marginal tentacles are elongated and differ from the others, as in the case of Drosera rotundifolia.  A fly was placed on a leaf, and in 18 hrs. it was embraced by the adjoining tentacles.  Gum-water dropped on several leaves produced no effect.  A fragment of a leaf was immersed in a few drops of a solution of one part of carbonate of ammonia to 146 of water; all the glands were instantly blackened; the process of aggregation could be seen travelling rapidly down the cells of the tentacles; and the granules of protoplasm soon united into spheres and variously shaped masses, which displayed the usual move- [page 281] ments.  Half a minim of a solution of one part of nitrate of ammonia to 146 of water was next placed on the centre of a leaf; after 6 hrs. some marginal tentacles on both sides were inflected, and after 9 hrs. they met in the centre.  The lateral edges of the leaf also became incurved, so that it formed a half-cylinder; but the apex of the leaf in none of my few trials was inflected.  The above dose of the nitrate (viz. 1/320 of a grain, or .202 mg.) was too powerful, for in the course of 23 hrs. the leaf died.

Drosera filiformis.—­This North American species grows in such abundance in parts of New Jersey as almost to cover the ground.  It catches, according to Mrs. Treat,* an extraordinary number of small and large insects, even great flies of the genus Asilus, moths, and butterflies.  The specimen which I examined, sent me by Dr. Hooker, had thread-like leaves, from 6 to 12 inches in length, with the upper surface convex and the lower flat and slightly channelled.  The whole convex surface, down to the roots—­for there is no distinct footstalk—­is covered with short gland-bearing tentacles, those on the margins being the longest and reflexed.  Bits of meat placed on the glands of some tentacles caused them to be slightly inflected in 20 m.; but the plant was not in a vigorous state.  After 6 hrs. they moved through an angle of 90o, and in 24 hrs. reached the centre.  The surrounding tentacles by this time began to curve inwards.  Ultimately a large drop of extremely viscid, slightly acid secretion was poured over the meat from the united glands.  Several